slashed zero in HTML code listings?

Subject: slashed zero in HTML code listings?
From: Robert Lauriston <robert -at- lauriston -dot- com>
To: techwr-l -at- lists -dot- techwr-l -dot- com
Date: Wed, 8 Jul 2009 13:18:02 -0700

One thing I've always wanted to do that I've never managed to achieve
was to use a slashed zero in code listings in HTML and HTML-based
online help.

The only monofont generally available is Courier New, and it doesn't
have that character.

So far as I can find, there's no HTML entity for it, which makes
sense: it's not a special character, it's just the way the zero is
designed in some fonts.

You can do 0&#x0338; to overlay a zero with a slash, but that looks
crappy, and doesn't seem to work within <code></code> or <pre></pre>
tags.
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